Also, the IP for tilde.club is on an email server blacklist.
https://mxtoolbox.com/SuperTool.aspx?action=blacklist%3a142.44.150.184&r...
Should be a process to get removed from that list, I know there is from Barracuda's blacklist as well as SpamHaus.
It could be that just not having a proper DKIM sig may trigger that blacklist though. There's a lot of blacklists out there and many work differently from one another.
Will
On Tue, 30 Dec 2025, Alexander wrote:
That is a problem that is caused by the uptight spam filter on Gmail which relies among other things on DKIM signatures and SPF which does not really play well with mail lists and tilde.club itself does not process DKIM signatures. There are a few mail protocol extensions that kind of mitigate that issue, but the only thing that is really working is to use a tilde.club email to send the mails
On 30/12/2025 14:03, lab6 wrote:
Hello all,
I’m not sure if this is the right place to say so, but I’ve noticed email to this mailing list being persistently classified as spam when it arrives at my Gmail account, despite me telling Gmail it looks safe. I’ve had to set up a filter to whitelist the tilde.club domain. Of course, if this is a problem for you too, you probably won’t see this message. Seasons greetings and a pre-emptive Happy New Year to you anyway!
James from Lab6
Sent from my iSeries